Ventilation unit for a refrigeration cabinet

Abstract

A ventilation unit for a low temperature chamber with a tube-shaped base body, having a heating element, an inlet side end with an inlet opening and an outlet side end with an outlet opening, wherein the base body has a tapered form such that the inlet opening has a greater area than the outlet opening. The inlet opening can be located in a first front side plane and the outlet opening can be located in a second front side plane, wherein the first front side plane and the second front side plane are substantially parallel offset with respect to one another, and wherein at perpendicular projection of the first front side plane onto the second front side plane, the inlet opening and the outlet opening are disposed offset with respect to one another. The base body can have a mechanical valve configured to open under pressure induction.

What is claimed: 
     
         1 . A ventilation unit for a low temperature chamber, comprising:
 a tube-shaped base body comprising a heating element, an inlet side end with an inlet opening and an outlet side end with an outlet opening, wherein the base body has a tapered form such that the inlet opening has a greater area than the outlet opening,   wherein the inlet opening is disposed in a first front side plane and the outlet opening is disposed in a second front side plane,   wherein the first front side plane and the second front side plane are disposed substantially parallel offset with respect to one another, and   wherein at a perpendicular projection of the first front side plane onto the second front side plane, the inlet opening and the outlet opening are disposed offset with respect to one another, and   wherein the base body has a mechanical valve which configured such that when a specified pressure difference between the inlet side end and the outlet side end is exceeded with an underpressure at the outlet side end, the valve opens under pressure induction while preventing an air stream from the outlet side end to the inlet side end.   
     
     
         2 . The ventilation unit as in  claim 1 , wherein in a perpendicular projection of the first front side plane onto the second front side plane, the inlet opening and the outlet opening are disposed offset with respect to one another such that no overlap of the inlet opening and the outlet opening is formed. 
     
     
         3 . The ventilation unit as in  claim 1 , wherein the valve comprises a valve seat and a disk-shaped valve body. 
     
     
         4 . The ventilation unit as in  claim 3 , wherein the disk-shaped valve body is disposed at an inclination toward the first front side plane. 
     
     
         5 . The ventilation unit as in  claim 4 , wherein the base body comprises a longitudinal axis and the disk-shaped valve body is disposed substantially perpendicularly to the longitudinal axis. 
     
     
         6 . The ventilation unit as in  claim 3 , wherein the disk-shaped valve body is mounted so as to be supported under pre-stress in a closed position. 
     
     
         7 . The ventilation unit as in  claim 3 , wherein the disk-shaped valve body is an umbrella valve. 
     
     
         8 . The ventilation unit as in  claim 3 , wherein the disk-shaped valve body is fabricated of silicone. 
     
     
         9 . The ventilation unit as in  claim 3 , wherein the disk-shaped valve body comprises a rotational axis oriented substantially parallel to a direction of air flow through the base body. 
     
     
         10 . The ventilation unit as in  claim 3 , wherein the base body comprises a second disk-shaped valve body. 
     
     
         11 . The ventilation unit as in  claim 10 , wherein rotational axes of the disk-shaped valve body and the second disk-shaped valve body have rotational axes with an angle with respect to each other of between 15° and 35°. 
     
     
         12 . The ventilation unit as in  claim 1 , wherein the base body further comprises an outer side and a heating element disposed thereon. 
     
     
         13 . The ventilation unit as in  claim 12 , wherein the outer side of the base body comprises grooves and/or projections to which the heating element is fixed. 
     
     
         14 . The ventilation unit as in  claim 13 , wherein the heating element is a heating filament. 
     
     
         15 . The ventilation unit as in  claim 1 , wherein the base body is fabricated of a thermoplastic synthetic material by an injection molding process. 
     
     
         16 . The ventilation unit as in  claim 1 , wherein the base body comprises two half-shells. 
     
     
         17 . The ventilation unit as in  claim 1 , further comprising a low temperature chamber. 
     
     
         18 . The ventilation unit as in  claim 17 , wherein the ventilation unit is installed in a wall of the low temperature chamber such that the inlet opening is directed toward the outer side and the outlet opening is directed toward the inner side of the low temperature chamber, wherein the outlet opening is disposed further down in the vertical direction than the inlet opening.